Previously I covered simple case with FlashCache, when data fits into cache partitions, now I am trying to test when data is bigger than cache.
But before test setup let me address some concern (which I also
had). Intel X25-M has a write cache which is not battery
backuped, so there is suspect you may have data loss in the case
of power outage.
And in the case with FlashCache it would mean you can send your database to trash, as there is no way to recovery from that ( only restore from backup).
I personally did couple of power failure tests and there is article on this topic http://www.anandtech.com/show/2614/10. I did not see any data loss in my tests, and the article says that the write cache "..isn't used for user data because of the risk of data …